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California · California (CIWQS)

Concord City

B
Seldom reaches water
Reported events
268
Total volume
168K gal
Reached waterways
20 (7%)
Reporting since
2007

What caused the overflows

Root Intrusion
111
Grease / FOG
93
Equipment Failure
48
Other / Unknown
16

Reported overflow events (showing 200 of 268)

DateVolumeCauseReached waterReceiving water
Dec 15, 202514K galGrease / FOG—n/A
Dec 10, 2025930 galRoot Intrusion——
May 31, 2025390 galGrease / FOG——
Mar 23, 20254K galEquipment FailureYesPine Creek
Nov 21, 20247K galGrease / FOG——
Jan 2, 202471 galEquipment Failure——
Dec 27, 202380 galEquipment Failure——
Dec 17, 20231K galEquipment FailureYesPine Creek
Dec 3, 2023300 galGrease / FOG——
Nov 27, 2023120 galEquipment Failure——
Nov 13, 2023173 galEquipment Failure——
Apr 20, 2023603 galGrease / FOG—Paved Surface;Street/Curb and Gutter
Feb 24, 2023108 galEquipment Failure—Separate Storm Drain
Feb 7, 202347 galGrease / FOG—Paved Surface;Unpaved surface
Nov 29, 2022121 galRoot Intrusion—Paved Surface;Separate Storm Drain;Street/Curb and Gutter
Sep 26, 2022141 galRoot IntrusionYesPaved Surface;Street/Curb and Gutter
Sep 5, 20223K galEquipment FailureYesPaved Surface;Separate Storm Drain
Aug 10, 2022384 galEquipment FailureYesPaved Surface;Separate Storm Drain;Unpaved surface
Jun 26, 2022715 galRoot IntrusionYesDrainage Channel
Jun 11, 202225 galRoot Intrusion—Street/Curb and Gutter
May 13, 20223 galEquipment Failure—Paved Surface
Apr 2, 202220 galEquipment Failure—Paved Surface
Mar 7, 2022140 galGrease / FOGYesPaved Surface;Separate Storm Drain
Mar 4, 20222K galEquipment FailureYesSeparate Storm Drain
Feb 11, 202220 galEquipment Failure—Paved Surface
Feb 8, 2022432 galEquipment Failure—Unpaved surface
Jan 14, 202210 galEquipment Failure—Paved Surface;Unpaved surface
Dec 10, 202125 galEquipment Failure—Paved Surface;Street/Curb and Gutter
Nov 28, 2021196 galRoot Intrusion—Paved Surface;Street/Curb and Gutter
Nov 3, 20215 galRoot Intrusion—Paved Surface;Unpaved surface
Sep 18, 20217K galEquipment FailureYesOther (specify below)
Jun 11, 202115 galGrease / FOG—Paved Surface;Separate Storm Drain;Street/Curb and Gutter
May 30, 202120 galRoot Intrusion—Paved Surface;Street/Curb and Gutter
May 28, 20213 galEquipment Failure—Unpaved surface
May 23, 2021990 galGrease / FOGYesPaved Surface;Street/Curb and Gutter
Apr 28, 202145 galEquipment Failure—Paved Surface;Separate Storm Drain;Street/Curb and Gutter
Feb 14, 20218K galRoot IntrusionYesSeparate Storm Drain;Street/Curb and Gutter;Surface Water
Jan 30, 20213 galRoot Intrusion—Street/Curb and Gutter
Dec 25, 2020555 galGrease / FOG—Paved Surface;Separate Storm Drain;Street/Curb and Gutter
Dec 1, 2020455 galRoot Intrusion—Separate Storm Drain
Nov 3, 2020530 galRoot Intrusion—Paved Surface;Street/Curb and Gutter;Unpaved surface
Oct 20, 202010 galRoot Intrusion—Paved Surface;Separate Storm Drain;Street/Curb and Gutter;Unpaved surface
Aug 12, 2020696 galRoot Intrusion—Paved Surface;Separate Storm Drain;Street/Curb and Gutter
Jul 4, 2020430 galRoot IntrusionYesPaved Surface;Separate Storm Drain;Street/Curb and Gutter
May 2, 20204K galRoot IntrusionYesOther (specify below)
Apr 7, 20205 galOther / Unknown—Paved Surface;Separate Storm Drain;Street/Curb and Gutter
Mar 31, 20205K galEquipment FailureYesPaved Surface;Separate Storm Drain;Unpaved surface
Feb 16, 202069 galRoot Intrusion—Street/Curb and Gutter
Feb 6, 20202 galEquipment Failure—Paved Surface
Jan 4, 202069 galRoot Intrusion—Paved Surface
Jan 2, 202022 galEquipment Failure—Paved Surface;Separate Storm Drain
Dec 30, 2019304 galEquipment Failure—Unpaved surface
Dec 25, 2019891 galGrease / FOGYesPaved Surface;Separate Storm Drain;Street/Curb and Gutter
Oct 24, 20193 galGrease / FOG—Unpaved surface
Oct 24, 20193 galEquipment Failure—Unpaved surface
Oct 8, 201918K galRoot IntrusionYesStreet/Curb and Gutter;Surface Water
Oct 3, 2019122 galGrease / FOG—Separate Storm Drain;Street/Curb and Gutter
Sep 23, 20193 galRoot Intrusion—Paved Surface
Sep 9, 201915 galRoot Intrusion—Unpaved surface
Sep 9, 20194 galRoot Intrusion—Unpaved surface
Jul 5, 2019950 galEquipment Failure—Paved Surface
Dec 21, 2018856 galEquipment Failure—Unpaved surface
Dec 17, 2018567 galEquipment Failure—Separate Storm Drain
Oct 5, 2018128 galEquipment Failure—Paved Surface;Separate Storm Drain;Street/Curb and Gutter;Unpaved surface
Sep 26, 2018189 galEquipment Failure—Paved Surface;Street/Curb and Gutter;Unpaved surface
Sep 6, 2018533 galGrease / FOG—Drainage Channel;Paved Surface;Separate Storm Drain;Street/Curb and Gutter
Sep 3, 20183 galRoot Intrusion—Paved Surface
Aug 29, 2018182 galEquipment Failure—Building or Structure;Unpaved surface
Aug 29, 2018182 galGrease / FOG—Building or Structure;Unpaved surface
Aug 17, 2018165 galEquipment Failure—Unpaved surface
Jul 19, 2018974 galGrease / FOG—Unpaved surface
Jun 25, 201832 galGrease / FOG—Street/Curb and Gutter
Jun 15, 2018192 galGrease / FOG—Separate Storm Drain;Street/Curb and Gutter
Jun 10, 2018252 galRoot Intrusion—Street/Curb and Gutter
Apr 21, 2018148 galEquipment Failure—Other (specify below);Separate Storm Drain;Street/Curb and Gutter
Mar 17, 201817K galGrease / FOGYesDrainage Channel;Street/Curb and Gutter;Unpaved surface
Feb 25, 20184 galEquipment Failure—Other (specify below)
Jan 29, 2018120 galGrease / FOG—Street/Curb and Gutter
Jan 23, 2018437 galRoot Intrusion—Separate Storm Drain;Street/Curb and Gutter;Unpaved surface
Jan 19, 2018540 galGrease / FOG—Drainage Channel;Street/Curb and Gutter
Jan 17, 2018740 galGrease / FOG—Paved Surface;Separate Storm Drain;Street/Curb and Gutter
Jan 14, 2018832 galGrease / FOG—Separate Storm Drain;Street/Curb and Gutter
Jan 12, 201832 galEquipment Failure—Paved Surface
Jan 7, 2018341 galRoot Intrusion—Street/Curb and Gutter
Dec 17, 2017695 galEquipment Failure—Unpaved surface
Dec 9, 20174K galGrease / FOG—Paved Surface;Separate Storm Drain;Street/Curb and Gutter;Unpaved surface
Nov 27, 20171 galRoot Intrusion—Unpaved surface
Nov 11, 20172 galRoot Intrusion—Paved Surface
Oct 5, 2017640 galEquipment Failure—Separate Storm Drain
Sep 30, 20173 galEquipment Failure—Unpaved surface
Apr 27, 2017336 galRoot Intrusion—Unpaved surface
Mar 3, 201798 galRoot Intrusion—Street/Curb and Gutter;Unpaved surface
Jan 31, 201717 galRoot Intrusion—Street/Curb and Gutter;Unpaved surface
Nov 29, 2016500 galGrease / FOG—Paved Surface;Street/Curb and Gutter
Nov 11, 2016366 galRoot Intrusion—Unpaved surface
Oct 25, 20164K galOther / Unknown—Unpaved surface
Oct 20, 2016660 galRoot Intrusion—Paved Surface;Street/Curb and Gutter
Jan 27, 2016825 galGrease / FOG—Building or Structure
Sep 29, 20152K galGrease / FOG—Paved Surface;Street/Curb and Gutter
May 7, 201520 galRoot Intrusion—Street/Curb and Gutter
May 2, 20153K galRoot Intrusion—Unpaved surface
Apr 21, 201510 galRoot Intrusion—Street/Curb and Gutter;Unpaved surface
Apr 12, 201550 galGrease / FOG—Unpaved surface
Jan 26, 2015589 galGrease / FOG—Paved Surface;Street/Curb and Gutter
Jan 12, 201596 galGrease / FOG—Paved Surface;Street/Curb and Gutter
Dec 29, 2014100 galRoot Intrusion—Unpaved surface
Dec 16, 2014303 galGrease / FOG—Paved Surface;Street/Curb and Gutter
Dec 8, 2014250 galEquipment Failure—Street/Curb and Gutter
Sep 6, 201440 galRoot Intrusion—Street/Curb and Gutter
Aug 21, 20145 galGrease / FOG—Paved Surface
Aug 20, 20145 galRoot Intrusion—Street/Curb and Gutter
Jun 14, 201415 galEquipment Failure—Unpaved surface
Jun 5, 20142 galRoot Intrusion—Paved Surface
May 20, 2014700 galRoot Intrusion—Separate Storm Drain;Street/Curb and Gutter
May 8, 20142 galGrease / FOG—Street/Curb and Gutter
Apr 9, 20147 galRoot Intrusion—Street/Curb and Gutter
Apr 5, 2014975 galGrease / FOGYesPaved Surface;Separate Storm Drain;Street/Curb and Gutter;Unpaved surface
Apr 4, 201418 galGrease / FOG—Paved Surface
Mar 13, 201430 galRoot Intrusion—Unpaved surface
Feb 4, 201432 galEquipment Failure—Street/Curb and Gutter
Feb 3, 20141K galRoot Intrusion—Street/Curb and Gutter
Jan 18, 2014980 galRoot IntrusionYesSeparate Storm Drain;Street/Curb and Gutter
Jan 10, 20142 galGrease / FOG—Paved Surface;Street/Curb and Gutter
Dec 5, 20138 galEquipment Failure—Street/Curb and Gutter
Dec 2, 201311 galRoot Intrusion—Paved Surface;Street/Curb and Gutter
Dec 1, 2013748 galRoot Intrusion—Paved Surface;Street/Curb and Gutter;Unpaved surface
Nov 29, 20133 galRoot Intrusion—Paved Surface
Nov 24, 20135 galGrease / FOG—Street/Curb and Gutter
Nov 9, 2013149 galRoot Intrusion—Street/Curb and Gutter
Sep 22, 2013540 galGrease / FOG—Paved Surface;Street/Curb and Gutter
Aug 1, 2013880 galGrease / FOG—Separate storm drain;Street/curb and gutter
Jul 4, 201389 galRoot Intrusion—Unpaved surface
Jun 23, 2013345 galGrease / FOG—Street/curb and gutter
Jun 18, 201320 galEquipment Failure—Street/curb and gutter
Jun 14, 20131K galRoot Intrusion—Separate storm drain;Street/curb and gutter
Jun 13, 2013277 galGrease / FOG—Street/curb and gutter
Jun 10, 2013960 galGrease / FOG—Other paved surface;Unpaved surface
Jun 2, 20132K galGrease / FOG—Separate storm drain;Street/curb and gutter
May 13, 201325 galGrease / FOG—Unpaved surface
May 6, 20132K galGrease / FOG—Separate storm drain;Street/curb and gutter;Unpaved surface
Apr 2, 2013150 galRoot Intrusion—Street/curb and gutter
Mar 28, 20134K galRoot Intrusion—Other paved surface
Mar 25, 2013650 galGrease / FOG—Separate storm drain;Street/curb and gutter;Unpaved surface
Mar 20, 201342 galRoot Intrusion—Street/curb and gutter
Feb 28, 201375 galRoot Intrusion—Street/curb and gutter
Feb 24, 2013200 galGrease / FOG—Street/curb and gutter
Feb 21, 201360 galRoot Intrusion—Street/curb and gutter
Feb 10, 20136K galGrease / FOG—Building or structure;Street/curb and gutter;Unpaved surface
Feb 2, 2013600 galOther / Unknown—Separate storm drain;Street/curb and gutter
Feb 1, 201350 galOther / Unknown—Street/curb and gutter
Jan 21, 201350 galRoot Intrusion—Street/curb and gutter
Dec 29, 201250 galGrease / FOG—Unpaved surface
Dec 28, 201215 galGrease / FOG—Street/curb and gutter
Dec 13, 201220 galOther / Unknown—Street/curb and gutter
Dec 1, 201215 galRoot Intrusion—Street/curb and gutter
Nov 24, 2012500 galRoot Intrusion—Separate storm drain;Street/curb and gutter
Nov 23, 20121K galRoot Intrusion—Separate storm drain;Street/curb and gutter
Nov 20, 20121K galOther / Unknown—Separate storm drain;Street/curb and gutter
Nov 15, 2012200 galGrease / FOG—Separate storm drain;Unpaved surface
Nov 13, 201230 galRoot Intrusion—Building or structure;Separate storm drain
Oct 13, 20121K galRoot Intrusion—Separate storm drain;Street/curb and gutter
Sep 1, 201280 galGrease / FOG—Street/curb and gutter;Unpaved surface
Aug 13, 20121K galGrease / FOG—Separate storm drain;Street/curb and gutter
Jul 28, 2012200 galGrease / FOG—Street/curb and gutter
Jul 27, 2012100 galGrease / FOG—Street/curb and gutter;Unpaved surface
May 15, 2012200 galGrease / FOG—Separate storm drain;Street/curb and gutter
May 6, 201210 galOther / Unknown—Street/curb and gutter
Apr 15, 201230 galRoot Intrusion—Street/curb and gutter
Apr 6, 20125 galRoot Intrusion—Other paved surface
Apr 5, 2012200 galOther / Unknown—Separate storm drain;Street/curb and gutter
Mar 12, 201220 galRoot Intrusion—Unpaved surface
Mar 11, 2012100 galOther / Unknown—Separate storm drain;Street/curb and gutter
Mar 10, 201240 galGrease / FOG—Street/curb and gutter
Mar 3, 2012100 galRoot Intrusion—Separate storm drain;Street/curb and gutter
Feb 25, 2012200 galGrease / FOG—Separate storm drain;Street/curb and gutter;Unpaved surface
Feb 8, 2012600 galGrease / FOG—Separate storm drain;Street/curb and gutter;Unpaved surface
Jan 25, 2012350 galGrease / FOG—Street/curb and gutter;Unpaved surface
Jan 21, 2012100 galGrease / FOG—Street/curb and gutter;Unpaved surface
Jan 18, 20125 galGrease / FOG—Street/curb and gutter
Jan 15, 2012800 galRoot Intrusion—Separate storm drain;Street/curb and gutter
Dec 18, 20111K galGrease / FOG—Separate storm drain;Street/curb and gutter
Oct 8, 2011200 galGrease / FOG—Separate storm drain;Street/curb and gutter
Sep 16, 201150 galRoot Intrusion—Building or structure
Sep 16, 201150 galRoot Intrusion—Building or structure
Aug 20, 20115 galRoot Intrusion—Street/curb and gutter
Jul 26, 2011600 galGrease / FOG—Separate storm drain;Street/curb and gutter
Jun 9, 20115 galOther / Unknown—Street/curb and gutter
May 12, 2011100 galRoot Intrusion—Street/curb and gutter
May 2, 201120 galOther / Unknown—Unpaved surface
Mar 31, 2011200 galGrease / FOG—Separate storm drain;Street/curb and gutter
Mar 28, 2011100 galRoot Intrusion—Separate storm drain;Street/curb and gutter
Mar 6, 2011150 galGrease / FOG—Separate storm drain;Street/curb and gutter
Mar 1, 2011100 galGrease / FOG—Separate storm drain;Street/curb and gutter
Feb 28, 2011300 galRoot Intrusion—Separate storm drain;Street/curb and gutter
Feb 26, 20115 galRoot Intrusion—Street/curb and gutter
Feb 25, 201150 galRoot Intrusion—Unpaved surface
Feb 21, 201150 galEquipment Failure—Separate storm drain;Street/curb and gutter
Jan 22, 201120 galGrease / FOG—Street/curb and gutter
Jan 14, 201150 galRoot Intrusion—Separate storm drain;Street/curb and gutter
Nov 17, 2010150 galGrease / FOG—Street/curb and gutter

Source: California (CIWQS). Volumes are utility-reported estimates. Some events lack precise coordinates or volumes.